package com.qf.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * @author zdl
 * @date 2025/1/16
 */
@WebFilter("/*")
public class LoginFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) servletRequest;
        HttpServletResponse resp = (HttpServletResponse) servletResponse;
        String uri = req.getRequestURI();
        HttpSession session = req.getSession();
        if (uri.contains("login")){
            filterChain.doFilter(servletRequest, servletResponse);
        }else {
            if (session.getAttribute("name") != null){
                filterChain.doFilter(servletRequest, servletResponse);
            }else {
                resp.sendRedirect("/login.jsp");
            }
        }
    }

    @Override
    public void destroy() {

    }
}
